I have 3 4k TVs and all 3 continue to display at 4k with the N2. BUT... I can hook up my XU4 with Batocera on it and it forces to whatever I set the boot.ini setting to, so I know they are not upscaling. Even the "stock" boot.ini settings of setenv hdmimode "1080p60hz" still displays at 4k with the N2. it is very frustrating!